The updated Kidde Firex KF20 alarms are mains powered, interlinking optical smoke alarms that use up to 70% less energy than previous Firex models. The KF20 has an alkaline battery back-up. The units are hard wired and can be interlinked with other units from the series to create all round fire protection within the home.

Power: Mains powered with battery backup
Backup Battery: 9V alkaline or self-charging longlife lithium backup options
Warranty: 6 year warranty
Up to 70% less energy consumption compared to previous Firex models
A maximum of 24 units can be interlinked via signal cable
Kitemarked to BS EN 14604: 2005 - view the certificate
Suitable for installations complying to BS 5839-6: 2019 Grade D1 (KF20R) or Grade D2 (KF20)
CE marked
LED indicator
Test / Hush button
Low battery warning chirp - can be silenced for 8 hours
Supplied with dust cover (to protect unit temporarily if you carry out dusty work)
Supplied with fixings; 2 x screws and 2 x rawl plugs
This alarm is also suitable for the updated 2022 Scottish legislation for fire alarms in homes

The Kidde Firex KF20 (previously KF2 / 4973 / PADC240) and KF20R (previously KF2R / 4985 / PAR230) are replacements for the Kidde 223/9HI and 223/9HILL series, and can be electrically interlinked. However, the new models cannot be used on the old base plates for the 223/9HI and 223/9HILL series as they use different style connector blocks. This means that base plates must be swapped over on those stated models and connectors need to be replaced.